Is it possible to invert the trackpad orientation for Mac OS X?

These should work on OS X 10.6, the key here is resetting the orientation:

With this hidden pref, the trackpad auto-detects hand orientation from 5 resting fingers and rotates the coordinate system to match.

So after setting these and rebooting, rest five fingers on the bottom of the track pad so that it will auto-orientate.

I know, it's a two-year bump, but I saw this question after responding to the identical but newer https://apple.stackexchange.com/questions/121499/reverse-magic-trackpad-turn-180%C2%B0… thought I'd keep this one current too.

sudo defaults write com.apple.MultitouchSupport ForceAutoOrientation YES

still works on Mavericks 10.9.5 (requires an admin pw and a reboot). I haven't personally tried defaults write com.apple.trackpad.orientation TrackpadOrientationMode 1 but that may still work too.

This appears not to work anymore on MacOS 10.12 (Sierra). Corroboration from Apple discussion forum, here: https://discussions.apple.com/message/30704137#message30704137